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I have 2 CDN 239 engines, original to a 50 Meteor and a 51 Mercury M-3. To my knowledge there was no serial number stamped on these blocks; only the production dates. If the engine date matched the serial # date you can only assume it came with the car/truck. My engine blocks also have some chicken scratches as well as "turtle" stamp punched in the block, I assume these to be production line signatures. Could the serial number be a "rebuild" stamp?